class CollectionTypeExtension
    extends AbstractTypeExtension
{
    private ?Randomizer $randomizer = null;
    private array $usedPrototypeNames = [];

    public static function getExtendedTypes(): iterable
    {
        return [CollectionType::class];
    }

    public function configureOptions(
        OptionsResolver $resolver,
    ): void
    {
        $resolver->setDefaults([
            'prototype_name_random_bytes' => 3,
            'prototype_name' => function (array $options): string {
                do {
                    $value = \sprintf(
                        '_:%s:_',
                        \bin2hex(
                            ($this->randomizer ??= new Randomizer(new Xoshiro256StarStar()))
                                ->getBytes($options['prototype_name_random_bytes'])
                        ),
                    );
                } while (isset($this->usedPrototypeNames[$value]));

                $this->usedPrototypeNames[$value] = true;

                return $value;
            },
        ]);
    }

    public function buildView(
        FormView $view,
        FormInterface $form,
        array $options,
    ): void
    {
        if (
            $options['prototype']
            && !isset($view->vars['attr']['data-prototype-name'])
            && $form->getConfig()->hasAttribute('resolved_prototype_name')
        ) {
            $view->vars['attr']['data-prototype-name'] = $form->getConfig()->getAttribute('resolved_prototype_name');
        }
    }
}